WO2015096735A1 - Digital pre-distortion parameter obtaining method and pre-distortion system - Google Patents
Digital pre-distortion parameter obtaining method and pre-distortion system Download PDFInfo
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- WO2015096735A1 WO2015096735A1 PCT/CN2014/094808 CN2014094808W WO2015096735A1 WO 2015096735 A1 WO2015096735 A1 WO 2015096735A1 CN 2014094808 W CN2014094808 W CN 2014094808W WO 2015096735 A1 WO2015096735 A1 WO 2015096735A1
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
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- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
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- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
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- H—ELECTRICITY
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- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3258—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits based on polynomial terms
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- H03F2200/198—A hybrid coupler being used as coupling circuit between stages of an amplifier circuit
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- H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
- H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
- H03F2201/3209—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion the amplifier comprising means for compensating memory effects
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- H—ELECTRICITY
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- H03F—AMPLIFIERS
- H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
- H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
- H03F2201/3224—Predistortion being done for compensating memory effects
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- H03F—AMPLIFIERS
- H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
- H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
- H03F2201/3227—Adaptive predistortion based on amplitude, envelope or power level feedback from the output of the main amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
- H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
- H03F2201/3233—Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0425—Circuits with power amplifiers with linearisation using predistortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
- H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
- H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
- H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
Definitions
- the invention relates to the field of digital predistortion processing, and in particular to a method for obtaining digital predistortion parameters and a predistortion system.
- the modified volterra series can more clearly describe the physical meaning of the nonlinear system, but its number of model parameters is exponential with the increase of system nonlinearity and memory length. The increase is only applicable to the study of weakly nonlinear systems, otherwise it will cause computational convergence problems.
- the memory effect produced by the power amplifier of the ultra-wideband signal is very serious.
- the memory effect of the power amplifier is caused by the inconsistent signal response of the power amplifier to each frequency point.
- the form of the power amplifier output signal is not only related to the current point signal, but also to the front of the power amplifier. At the moment, obviously, as the signal bandwidth increases, the memory depth of the amplifier is also significantly deepened.
- the amplifier as an analog device is itself a nonlinear system with amplitude-amplitude (AM-AM) and amplitude-phase (AM-PM) nonlinear distortion.
- AM-AM distortion refers to the distortion of the amplitude of the output signal and the input signal.
- AM-PM distortion refers to the change in the amplitude of the nonlinear power amplifier input signal, resulting in a change in the phase difference between the output and the input signal.
- the narrowband signal is input, the influence of the memory effect is relatively small, and the AM-AM and AM-PM distortion of the power amplifier can be corrected to achieve a better effect.
- the bandwidth of the signal increases, especially for ultra-wideband signals such as 100M in the next generation of mobile communications, the memory effect of the power amplifier is very serious, making the power amplifier become a very complex system of linear and nonlinear distortion, for such a system.
- the embodiment of the invention provides a method for obtaining predistortion parameters and a predistortion system for simplifying the computational complexity of the model while achieving good signal processing effects.
- the predistortion processed predistortion signal and the process are obtained.
- a first feedback signal processed by the power amplifier, the predistortion signal being obtained according to the following predistortion model:
- z(n) represents the predistorted signal output at time n
- x(n) represents the original signal input at time n
- n represents the input time of the original signal
- m represents the memory moment of the original signal
- w represents the Distortion parameter
- M represents the memory depth
- Q represents the nonlinear order
- L represents the maximum cross-sampling point
- q represents the nonlinear order index
- * represents the conjugate of the signal
- l represents the cross-sampling point
- x (nm) represents the original signal
- x*(nm) represents a conjugate signal of the original signal
- the predistortion parameter index table is updated according to the determined predistortion parameters.
- the original signal is used to replace the conjugate signal of the original signal in the predistortion model according to a signal vector relationship between the original signal and the conjugate signal of the original signal, and the replaced predistortion model is:
- exp(-j2 ⁇ m1 +j2 ⁇ m2 ) represents the vector relationship between the original signal and the conjugate signal of the original signal
- ⁇ represents the complex angle of the original signal
- the above technical solution in the embodiment of the present invention reduces the computational complexity of the overall predistortion model by simplifying the time conjugate interleaving model in the predistortion model, thereby saving multiplier resources.
- the existing algorithm can be used when acquiring the signal amplitude (ie, the first feedback signal), and the complex angle of the signal can be obtained while acquiring the signal amplitude. Therefore, the simplified process of the model in the embodiment of the present invention is based on the existing The resource is realized without additional resources, and the implementation is simple and convenient.
- the replaced predistortion model is further changed according to a correspondence between a predistortion parameter in the predistortion parameter index table and an original signal amplitude:
- the LUT represents a predistortion parameter index table
- ) represents the signal amplitude
- the predistortion model has a corresponding relationship between the predistortion parameter and the signal amplitude of the original signal, and the predistortion model is further performed by extracting a common factor. Simplification reduces the overall complexity of the predistortion model.
- performing the canceling the rated linear gain on the first feedback signal to obtain the second feedback signal specifically includes:
- the second feedback signal is formed by a first feedback signal that cancels the nominal linear gain and a conjugate signal of the first feedback signal.
- the conjugate signal of the first feedback signal needs to be cancelled by the rated linear gain.
- the pre-distortion parameter is determined according to the matrix formed by the second feedback signal and the matrix formed according to the pre-distortion signal, and specifically includes:
- a predistortion parameter is determined based on a least squares solution of the predistortion parameter.
- the solution of the linear equation is determined by using the least squares principle.
- the matrix decomposition method or the fast Cholesky decomposition method may be used to solve the matrix coefficients.
- the embodiment of the invention further provides a digital predistortion processing system, the system comprising:
- a predistorter for performing predistortion processing on the input original signal after the periodic filtering process starts, outputting a predistortion signal to the power amplifier; and updating a predistortion parameter index table according to the predistortion parameter sent by the operator, the pre The distortion signal is obtained according to the following predistortion model:
- z(n) represents the predistorted signal output at time n
- x(n) represents the original signal input at time n
- n represents the input time of the original signal
- m represents the memory moment of the original signal
- w represents the Distortion parameter
- M represents memory depth
- Q represents nonlinear order
- L represents maximum crossover Sample point
- q represents a nonlinear order index
- * denotes the conjugate of the signal
- l denotes a cross-sample point
- x(n-m) denotes the original signal
- x*(n-m) denotes a conjugate signal of the original signal
- a power amplifier configured to perform power amplifier on the predistortion signal output by the predistorter, and output a first feedback signal to the operator;
- a novel digital predistortion processing model is proposed.
- the predistorter uses the model proposed by the embodiment of the present invention to process the original signal, thereby achieving the overall signal processing performance of the system. It also simplifies the complexity of the operation.
- the embodiment of the invention provides a novel predistortion model, which is a croppable PVS model, compares the MP model, adds a cross-project model, and adopts an architecture near the MP model, thereby achieving a greatly reduced model operation on the one hand.
- the complexity on the other hand, effectively reflects the main nonlinearity of the power amplifier.
- FIG. 1 is a schematic flowchart of a method for obtaining a digital predistortion parameter according to an embodiment of the present invention
- FIG. 2 is a schematic diagram of a phase relationship between an original signal and a conjugate signal thereof according to an embodiment of the present invention
- FIG. 3 is a schematic flowchart diagram of a detailed implementation example of a method for obtaining a digital predistortion parameter according to an embodiment of the present disclosure
- FIG. 4 is a schematic structural diagram of a system of a digital predistortion processing system according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of a signal flow of a digital predistortion processing system according to an embodiment of the present invention.
- the embodiment of the present invention provides a method for obtaining pre-distortion parameters and a pre-distortion system for Simplify the computational complexity of the model while achieving good signal processing.
- an embodiment of the present invention provides a method for determining a digital predistortion parameter. As shown in FIG. 1, the method includes:
- z(n) represents the predistorted signal output at time n
- x(n) represents the original signal input at time n
- n represents the input time of the original signal
- m represents the memory moment of the original signal
- w represents the Distortion parameter
- M represents the memory depth
- Q represents the nonlinear order
- L represents the maximum cross-sampling point
- q represents the nonlinear order index
- * represents the conjugate of the signal
- l represents the cross-sampling point
- x (nm) represents the original signal
- x*(nm) represents a conjugate signal of the original signal
- the predistortion model proposed by the embodiment of the present invention is actually a PVS model, and the PVS model is A PVS model between the MP model and the Volterra series model.
- This model more fully reflects the nonlinear characteristics of the power amplifier by using the sequence of intersecting items at the adjacent time.
- This model adopts the sequence of intersecting items at the adjacent time. More comprehensive reflection of the nonlinear characteristics of the power amplifier.
- the PVS model can also be said to be a model cut out from the Volterra model. In use, only the nonlinear order Q, the memory depth M, and the cross-sampling point L need to be configured to fully characterize the model. Looking closely at the predistortion model of the embodiment of the present invention, the total large model includes three small models that are cropped from the Volterra model, specifically:
- the embodiment of the present invention adopts these three small models to form a total predistortion model of the embodiment of the present invention.
- the computational complexity is significantly reduced, and the applicant's test uses the pre-preparation of the embodiment of the present invention.
- the four-carrier (80MHz) performance test of the Long Term Evolution (LTE) system is as follows.
- the Adjacent Channel Power Ratio (ACPR) can be up to 5-6dBc.
- the predistortion model provided by the embodiment of the present invention requires a large number of multipliers due to the square multiplication of the conjugate item and the signal.
- the original signal is used to replace the conjugate signal of the original signal in the predistortion model, and the replaced predistortion model is:
- exp(-j2 ⁇ m1 +j2 ⁇ m2 ) represents the vector relationship between the original signal and the conjugate signal of the original signal
- ⁇ represents the complex angle of the original signal
- the relationship between the conjugate signal and the original signal is clearly shown in the figure.
- the amplitude of the conjugate signal in the time-interleaved conjugate memory polynomial can be the original signal.
- the amplitude is replaced by the specific process:
- ⁇ 1 actan(imag(x(nm))/real(x(nm)));
- ⁇ 2 atan(imag(x(nml))/real(x(nml)));
- the embodiment of the present invention reduces the computational complexity of the overall predistortion model by simplifying the time conjugate interleaving model in the predistortion model, thereby saving multiplier resources.
- an existing algorithm can be used when acquiring the signal amplitude (ie, the original signal), and the complex angle of the signal can be obtained while acquiring the amplitude of the signal.
- the CORDIC algorithm uses the CORDIC algorithm to synchronization of the amplitude of the acquired signal.
- the complex angle of the signal is also obtained. Therefore, the simplified process of the model in the embodiment of the present invention is implemented according to existing resources, and no additional resources are needed, and the implementation is simple and convenient.
- the simplified pre-loss in the embodiment of the present invention is carefully observed.
- the true model shows that it can be further simplified by extracting the common factor, so the predistortion model can be further simplified as:
- the LUT represents an index table of predistortion parameters.
- the LUT table generation process is given:
- the amplitude interval in the LUT table is generated as follows:
- the storage space of one LUT is the length of A*(4L+1)*M.
- ) is a predistortion parameter corresponding to the input original signal amplitude
- the reason why the predistortion model can be simplified into the formula (4) in the above embodiment is achieved by simplifying the time-interleaved conjugate memory polynomial in the predistortion model.
- the embodiment of the present invention can be implemented by simplifying the time interleaved memory polynomial model part based on the formula (3).
- the time interleaving item in the time-interleaved memory polynomial has less and less influence as the memory depth increases, that is, the interlaced part of the signal leaves with the increase of the memory depth.
- the predistortion model provided by the embodiment of the present invention may finally be:
- the above embodiments of the present invention provide a memory in the polynomial model by omitting some time interleaving memory according to the existing rules of time interleaving in the time-interleaved memory polynomial as the memory depth increases, which is less and less affected.
- a deeper time interleaving project achieves the goal of reducing the overall computational complexity of the overall predistortion model.
- the applicant proves that the object of the invention can be achieved by using the formula (1), (4) or (6), that is, improving the signal performance. At the same time, reduce the computational complexity of the predistortion model.
- the second feedback signal is obtained by canceling the rated linear gain of the first feedback signal, and the method includes:
- the second feedback signal is formed by a first feedback signal that cancels the nominal linear gain and a conjugate signal of the first feedback signal.
- y represents the first feedback signal
- u represents the first feedback signal that cancels the rated linear gain of the power amplifier
- G represents the rated linear gain
- n represents the input moment of the first feedback signal
- m represents the memory moment of the first feedback signal
- M represents Memory depth
- Q represents a nonlinear order
- L represents the maximum cross-sampling point
- q represents a nonlinear order index
- l represents a cross-sampling point
- y* represents the conjugate signal of the first feedback signal
- u* represents the conjugate signal of the first feedback signal after canceling the rated linear gain of the power amplifier
- G represents the rated linear gain
- n represents the input timing of the first feedback signal
- m Representing the memory moment of the first feedback signal
- M represents the memory depth
- Q represents the nonlinear order
- L represents the maximum cross-sample point
- q represents the nonlinear order index
- l represents the cross-sample point.
- the pre-distortion model includes the conjugate signal of the first feedback signal and the first feedback signal, when performing the rated linear gain cancellation, the two formulas are separately calculated. And finally all with Together form a matrix U of the second feedback signal.
- the pre-distortion parameter is determined according to the matrix formed by the second feedback signal and the matrix formed according to the pre-distortion signal, and specifically includes:
- a predistortion parameter is determined based on a least squares solution of the predistortion parameter.
- the predistortion model is infinitely approximated to the power amplifier model, it can be considered that the predistortion signal z and the first feedback signal y have the following relationship:
- the foregoing embodiment of the embodiment of the present invention calculates the predistortion parameter by using the above relationship between the first feedback signal and the predistortion signal, and obtains the matrix and the predistortion signal of the second feedback signal.
- the above matrix relation can be changed to calculate the least squares solution of the predistortion parameter. Since the inverse of the matrix is involved in the calculation of the least squares solution of the predistortion parameter, the operation is more complicated.
- the matrix decomposition method can avoid the inversion of the matrix.
- the common matrix decomposition method has QR (Orthogonal-triangular Decomposition). Decomposition, SVD, Singular Value Decomposition decomposition, etc.
- matrix inversion can be avoided by using the adaptive LS algorithm, such as Recursive Least Square (RLS).
- the model of the cross-project is added, and the architecture near the MP model is adopted, which can greatly save the complexity of the model on the one hand, and can effectively reflect the main non-power of the power amplifier on the other hand. Linear.
- the PVS model proposed by the embodiment of the present invention is based on a croppable model, and the parameter configuration (non-linear order, memory depth, and cross-sampling point) corresponding to the power amplifier can be adaptively adjusted according to the actual situation of the power amplifier to meet different power amplifiers. Claim.
- formula (3) is used as a predistortion model:
- x(n) represents the original signal input at time n
- z(n) represents the pre-distorted signal output at time n
- y(n) represents the first feedback signal
- n represents the input moment of the signal
- m represents the signal.
- Memory moment w represents the predistortion parameter
- M represents the memory depth
- Q represents the nonlinear order
- L represents the maximum cross-sampling point
- q represents the nonlinear order index
- * represents the conjugate of the signal
- l represents the cross-sampling point
- x (nm) represents the signal amplitude of the original signal
- x*(nm) represents the signal amplitude of the conjugate signal of the original signal
- y(nm) represents the signal amplitude of the first feedback signal
- y*(nm) represents the first The signal amplitude of the conjugate signal of the feedback signal
- G represents the rated linear gain
- u represents the first feedback signal after canceling the rated linear gain of the power
- the predistorter processes the original signal according to the previously updated LUT table and the predistortion model, and outputs a predistortion signal.
- the predistorter extracts corresponding predistortion parameters in the last updated LUT table according to different amplitudes of the input original signals
- the predistortion signal is changed from a digital signal to an analog signal by a digital-to-analog conversion module;
- S205 Receive a first feedback signal that passes through a power amplifier process through a radio frequency receiver.
- the first feedback signal converted into the digital signal is cancelled by the rated linear gain to obtain a second feedback signal.
- formula (7) can be transformed into The matrix formed by the predistortion signal and the matrix formed by the second feedback signal are brought into the above formula to determine the least squares solution of the predistortion parameter w (since this formula is a set of overdetermined equations.
- This embodiment may adopt the principle of least squares Determining the solution of the linear equation, using the QR decomposition method of the matrix or the fast Cholesky decomposition method to solve the matrix coefficient in the actual process);
- the predistorter performs digital predistortion processing on the next original signal according to the updated LUT table.
- the embodiment of the present invention further provides a digital pre-distortion processing system.
- the system includes:
- the predistorter 1 is configured to perform predistortion processing on the input original signal after the periodic filtering process starts, output a predistortion signal to the power amplifier, and update the predistortion parameter index table according to the predistortion parameter sent by the operator;
- the power amplifier 2 is configured to perform power amplifier on the predistortion signal output by the predistorter, and output a first feedback signal to the operator, where the predistortion signal is obtained according to the following predistortion model:
- z(n) represents the predistorted signal output at time n
- x(n) represents the original signal input at time n
- n represents the input time of the original signal
- m represents the memory moment of the original signal
- w represents the Distortion parameter
- M represents the memory depth
- Q represents the nonlinear order
- L represents the maximum cross-sampling point
- q represents the nonlinear order index
- * represents the conjugate of the signal
- l represents the cross-sampling point
- x (nm) represents the original signal
- x*(nm) represents a conjugate signal of the original signal
- the operator 3 is configured to acquire the predistortion signal and the first feedback signal, and perform a cancellation of a nominal linear gain on the first feedback signal to obtain a second feedback signal; a matrix formed according to the second feedback signal and And determining a predistortion parameter according to the matrix formed by the predistortion signal, and transmitting the determined predistortion parameter to a predistorter.
- a novel digital predistortion processing model is proposed.
- the predistorter uses the model proposed by the embodiment of the present invention to process the signal, thereby achieving the signal processing performance of the system as a whole. It also simplifies the complexity of the operation.
- the original signal is used to replace the conjugate signal of the original signal in the predistortion model according to the signal vector relationship between the original signal and the conjugate signal of the original signal.
- the replaced predistortion model is:
- exp(-j2 ⁇ m1 +j2 ⁇ m2 ) represents the vector relationship between the original signal and the conjugate signal of the original signal
- ⁇ represents the complex angle of the original signal
- the pre-distortion of the replacement is performed according to a correspondence between a predistortion parameter in the predistortion parameter index table and a signal amplitude of an original signal.
- the model is further changed to:
- the LUT represents a predistortion parameter index table
- ) represents the signal amplitude
- the operator performs a second linear feedback signal on the first feedback signal to obtain a second feedback signal, which specifically includes:
- the second feedback signal is formed by a first feedback signal that cancels the nominal linear gain and a conjugate signal of the first feedback signal.
- the operator passes the following Eliminating the nominal linear gain of the first feedback signal:
- y represents the first feedback signal
- u represents the first feedback signal that cancels the rated linear gain of the power amplifier
- G represents the rated linear gain
- n represents the input moment of the first feedback signal
- m represents the memory moment of the first feedback signal
- M represents Memory depth
- Q represents a nonlinear order
- L represents the maximum cross-sampling point
- q represents a nonlinear order index
- l represents a cross-sampling point
- the operator eliminates the nominal linear gain of the conjugate signal of the first feedback signal by the following formula:
- y* represents the conjugate signal of the first feedback signal
- u* represents the conjugate signal of the first feedback signal after canceling the rated linear gain of the power amplifier
- G represents the rated linear gain
- n represents the input timing of the first feedback signal
- m Representing the memory moment of the first feedback signal
- M represents the memory depth
- Q represents the nonlinear order
- L represents the maximum cross-sample point
- q represents the nonlinear order index
- l represents the cross-sample point.
- the operator determines a predistortion parameter according to the matrix formed by the second feedback signal and the matrix formed according to the predistortion signal, and specifically includes:
- the predistortion parameter is determined based on the least squares solution of the predistortion parameter.
- embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention may employ computer-usable storage media (including but not limited to disks) in one or more of the computer-usable program code embodied therein. A form of computer program product embodied on a memory and optical storage, etc.).
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
Description
Claims (12)
- 一种数字预失真参数的求取方法,其特征在于,该方法包括:A method for determining a digital predistortion parameter, the method comprising:在周期性滤波处理开始后,获取经过预失真处理后的预失真信号和经过功放处理后的第一反馈信号,所述预失真信号根据如下预失真模型获得:After the periodic filtering process starts, the predistortion processed predistortion signal and the power amplifier processed first feedback signal are obtained, and the predistortion signal is obtained according to the following predistortion model:其中,z(n)表示n时刻输出的经过预失真处理后的信号,x(n)表示n时刻输入的原始信号,n表示原始信号的输入时刻,m表示原始信号的记忆时刻,w表示预失真参数,M表示记忆深度,Q表示非线性阶数,L表示最大交叉采样点,q表示非线性阶数索引,*表示信号的共轭,l表示交叉采样点,x(n-m)表示原始信号,x*(n-m)表示原始信号的共轭信号;Where z(n) represents the predistorted signal output at time n, x(n) represents the original signal input at time n, n represents the input time of the original signal, m represents the memory moment of the original signal, and w represents the Distortion parameter, M represents the memory depth, Q represents the nonlinear order, L represents the maximum cross-sampling point, q represents the nonlinear order index, * represents the conjugate of the signal, l represents the cross-sampling point, and x (nm) represents the original signal , x*(nm) represents a conjugate signal of the original signal;对所述第一反馈信号进行消除额定线性增益得到第二反馈信号;Performing a cancellation of a nominal linear gain on the first feedback signal to obtain a second feedback signal;根据所述第二反馈信号形成的矩阵及根据所述预失真信号形成的矩阵确定预失真参数;Determining a predistortion parameter according to a matrix formed by the second feedback signal and a matrix formed according to the predistortion signal;根据确定的预失真参数更新预失真参数索引表。The predistortion parameter index table is updated according to the determined predistortion parameters.
- 如权利要求1所述的方法,其特征在于,根据原始信号与原始信号的共轭信号二者之间信号向量关系,采用原始信号替代所述预失真模型中的原始信号的共轭信号,替代后的所述预失真模型为: The method according to claim 1, wherein the original signal is used instead of the conjugate signal of the original signal in the predistortion model according to a signal vector relationship between the original signal and the conjugate signal of the original signal. The latter predistortion model is:其中,exp(-j2θm1+j2θm2)表示原始信号与原始信号的共轭信号之间的向量关系,θ表示原始信号的复角。Where exp(-j2θ m1 +j2θ m2 ) represents the vector relationship between the original signal and the conjugate signal of the original signal, and θ represents the complex angle of the original signal.
- 如权利要求2所述的方法,其特征在于,根据所述预失真参数索引表中预失真参数与原始的信号幅值之间的对应关系,将所述替代后的所述预失真模型进一步变化为:The method according to claim 2, wherein said replaced predistortion model is further changed according to a correspondence between a predistortion parameter in said predistortion parameter index table and an original signal amplitude for:其中,LUT表示预失真参数索引表,LUTm(|x(n-m)|)表示原始信号的信号幅值|x(n-m)|在LUT表中所对应的预失真参数。Wherein, the LUT represents a predistortion parameter index table, and the LUT m (|x(nm)|) represents the signal amplitude |x(nm)| of the original signal; the predistortion parameter corresponding to the LUT table.
- 如权利要求3所述的方法,其特征在于,对所述第一反馈信号进行消除额定线性增益得到第二反馈信号,具体包括:The method of claim 3, wherein the canceling the nominal linear gain of the first feedback signal to obtain the second feedback signal comprises:消除所述第一反馈信号的额定线性增益;Eliminating a nominal linear gain of the first feedback signal;消除所述第一反馈信号的共轭信号的额定线性增益;Eliminating a nominal linear gain of the conjugate signal of the first feedback signal;经过消除额定线性增益的第一反馈信号和第一反馈信号的共轭信号组成所述第二反馈信号。The second feedback signal is formed by a first feedback signal that cancels the nominal linear gain and a conjugate signal of the first feedback signal.
- 如权利要求4所述的方法,其特征在于,通过下列公式消除所述第一 反馈信号的额定线性增益:The method of claim 4 wherein said first is eliminated by the following formula Rated linear gain of the feedback signal:(0≤l≤L,m=1...M,q=1...Q)其中,y表示第一反馈信号,u表示消除功放额定线性增益的第一反馈信号,G表示额定线性增益,n表示第一反馈信号的输入时刻,m表示第一反馈信号的记忆时刻,M表示记忆深度,Q表示非线性阶数,L表示最大交叉采样点,q表示非线性阶数索引,l表示交叉采样点; (0≤l≤L,m=1...M,q=1...Q) where y represents the first feedback signal, u represents the first feedback signal that cancels the rated linear gain of the power amplifier, and G represents the rated linear gain , n represents the input moment of the first feedback signal, m represents the memory moment of the first feedback signal, M represents the memory depth, Q represents the nonlinear order, L represents the maximum cross-sampling point, q represents the nonlinear order index, and l represents Cross sampling point通过下列公式消除所述第一反馈信号的共轭信号的额定线性增益:The nominal linear gain of the conjugate signal of the first feedback signal is eliminated by the following equation:其中,y*表示第一反馈信号的共轭信号,u*表示消除功放额定线性增益后的第一反馈信号的共轭信号,G表示额定线性增益,n表示第一反馈信号的输入时刻,m表示第一反馈信号的记忆时刻,M表示记忆深度,Q表示非线性阶数,L表示最大交叉采样点,q表示非线性阶数索引,l表示交叉采样点。Where y* represents the conjugate signal of the first feedback signal, u* represents the conjugate signal of the first feedback signal after canceling the rated linear gain of the power amplifier, G represents the rated linear gain, and n represents the input timing of the first feedback signal, m Representing the memory moment of the first feedback signal, M represents the memory depth, Q represents the nonlinear order, L represents the maximum cross-sample point, q represents the nonlinear order index, and l represents the cross-sample point.
- 如权利要求1所述的方法,其特征在于,根据所述第二反馈信号形成的矩阵及根据所述预失真信号形成的矩阵确定预失真参数,具体包括:The method of claim 1, wherein determining a predistortion parameter according to the matrix formed by the second feedback signal and the matrix formed according to the predistortion signal comprises:将所述第二反馈信号形成的矩阵及根据所述预失真信号形成的矩阵带入到公式确定预失真参数的最小二乘解,其中,表示预失真参数的最小二乘解,z表示预失真信号形成的矩阵,U表示第二反馈信号形成的矩阵,UH表示矩阵的U的共轭矩阵;Forming a matrix formed by the second feedback signal and a matrix formed according to the predistortion signal into a formula Determining a least squares solution of the predistortion parameter, wherein a least squares solution representing the predistortion parameter, z represents a matrix formed by the predistortion signal, U represents a matrix formed by the second feedback signal, and U H represents a conjugate matrix of U of the matrix;根据所述预失真参数的最小二乘解确定预失真参数。A predistortion parameter is determined based on a least squares solution of the predistortion parameter.
- 一种数字预失真处理系统,其特征在于,该系统包括:A digital predistortion processing system, the system comprising:预失真器,用于在周期性滤波处理开始后,对输入的原始信号进行预失真处理,向功放器输出预失真信号;根据运算器发送的预失真参数更新预失真参数索引表,所述预失真信号根据如下预失真模型获得: a predistorter for performing predistortion processing on the input original signal after the periodic filtering process starts, outputting a predistortion signal to the power amplifier; and updating a predistortion parameter index table according to the predistortion parameter sent by the operator, the pre The distortion signal is obtained according to the following predistortion model:其中,z(n)表示n时刻输出的经过预失真处理后的信号,x(n)表示n时刻输入的原始信号,n表示原始信号的输入时刻,m表示原始信号的记忆时刻,w表示预失真参数,M表示记忆深度,Q表示非线性阶数,L表示最大交叉采样点,q表示非线性阶数索引,*表示信号的共轭,l表示交叉采样点,x(n-m)表示原始信号,x*(n-m)表示原始信号的共轭信号;Where z(n) represents the predistorted signal output at time n, x(n) represents the original signal input at time n, n represents the input time of the original signal, m represents the memory moment of the original signal, and w represents the Distortion parameter, M represents the memory depth, Q represents the nonlinear order, L represents the maximum cross-sampling point, q represents the nonlinear order index, * represents the conjugate of the signal, l represents the cross-sampling point, and x (nm) represents the original signal , x*(nm) represents a conjugate signal of the original signal;功放器,用于对预失真器输出的预失真信号进行功放,并向运算器输出第一反馈信号;a power amplifier, configured to perform power amplifier on the predistortion signal output by the predistorter, and output a first feedback signal to the operator;运算器,用于获取所述预失真信号和所述第一反馈信号,并对所述第一反馈信号进行消除额定线性增益得到第二反馈信号;根据所述第二反馈信号形成的矩阵及根据所述预失真信号形成的矩阵确定预失真参数,将所述确定的预失真参数发送到预失真器。An operator for acquiring the predistortion signal and the first feedback signal, and performing a cancellation of a nominal linear gain on the first feedback signal to obtain a second feedback signal; a matrix formed according to the second feedback signal and a basis The matrix formed by the predistortion signal determines a predistortion parameter that is sent to the predistorter.
- 如权利要求7所述的系统,其特征在于,根据原始信号与原始信号的共轭信号二者之间信号向量关系,采用原始信号替代所述预失真模型中的原始信号的共轭信号,替代后的所述预失真模型为:The system according to claim 7, wherein the original signal is used instead of the conjugate signal of the original signal in the predistortion model in accordance with a signal vector relationship between the original signal and the conjugate signal of the original signal. The latter predistortion model is:其中,exp(-j2θm1+j2θm2)表示原始信号与原始信号的共轭信号之间的向量 关系,θ表示原始信号的复角。Where exp(-j2θ m1 +j2θ m2 ) represents the vector relationship between the original signal and the conjugate signal of the original signal, and θ represents the complex angle of the original signal.
- 如权利要求8所述的系统,其特征在于,根据所述预失真参数索引表中预失真参数与原始信号的信号幅值之间的对应关系,将所述替代后的所述预失真模型进一步变化为:The system according to claim 8, wherein said replaced predistortion model is further further based on a correspondence between a predistortion parameter in said predistortion parameter index table and a signal amplitude of said original signal Change to:其中,LUT表示预失真参数索引表,LUTm(|x(n-m)|)表示原始信号的信号幅值|x(n-m)|在LUT表中所对应的预失真参数。Wherein, the LUT represents a predistortion parameter index table, and the LUT m (|x(nm)|) represents the signal amplitude |x(nm)| of the original signal; the predistortion parameter corresponding to the LUT table.
- 如权利要求9所述的系统,其特征在于,所述运算器对所述第一反馈信号进行消除额定线性增益得到第二反馈信号,具体包括:The system of claim 9, wherein the operator performs the elimination of the nominal linear gain on the first feedback signal to obtain a second feedback signal, which specifically includes:消除所述第一反馈信号的额定线性增益;Eliminating a nominal linear gain of the first feedback signal;消除所述第一反馈信号的共轭信号的额定线性增益;Eliminating a nominal linear gain of the conjugate signal of the first feedback signal;经过消除额定线性增益的第一反馈信号和第一反馈信号的共轭信号组成所述第二反馈信号。The second feedback signal is formed by a first feedback signal that cancels the nominal linear gain and a conjugate signal of the first feedback signal.
- 如权利要求10所述的系统,其特征在于,所述运算器通过下列公式消除所述第一反馈信号的额定线性增益:The system of claim 10 wherein said operator cancels a nominal linear gain of said first feedback signal by:(0≤l≤L,m=1...M,q=1...Q)其中,y表示第一反馈信号,u表示消除功放额定线性增益的第一反馈信号,G表示额定线性增益,n表示第一反馈信号的输入时刻,m表示第一反馈信号的记忆时刻,M表示记忆深度,Q表示非线性阶数,L表示最大交叉采样点,q表示非线性阶数索引,l表示交叉采样点; (0≤l≤L,m=1...M,q=1...Q) where y represents the first feedback signal, u represents the first feedback signal that cancels the rated linear gain of the power amplifier, and G represents the rated linear gain , n represents the input moment of the first feedback signal, m represents the memory moment of the first feedback signal, M represents the memory depth, Q represents the nonlinear order, L represents the maximum cross-sampling point, q represents the nonlinear order index, and l represents Cross sampling point所述运算器通过下列公式消除所述第一反馈信号的共轭信号的额定线性增益:The operator eliminates the nominal linear gain of the conjugate signal of the first feedback signal by the following formula:
- 如权利要求7所述的系统,其特征在于,所述运算器根据所述第二反馈信号形成的矩阵及根据所述预失真信号形成的矩阵确定预失真参数,具体包括:The system according to claim 7, wherein the operator determines a predistortion parameter according to the matrix formed by the second feedback signal and the matrix formed according to the predistortion signal, and specifically includes:将所述第二反馈信号形成的矩阵及根据所述预失真信号形成的矩阵带入到公式确定预失真参数的最小二乘解,其中,表示预失真参数的最小二乘解,z表示预失真信号形成的矩阵,U表示第二反馈信号形成的矩阵,UH表示矩阵的U的共轭矩阵;Forming a matrix formed by the second feedback signal and a matrix formed according to the predistortion signal into a formula Determining a least squares solution of the predistortion parameter, wherein a least squares solution representing the predistortion parameter, z represents a matrix formed by the predistortion signal, U represents a matrix formed by the second feedback signal, and U H represents a conjugate matrix of U of the matrix;根据预失真参数的最小二乘解确定预失真参数。 The predistortion parameter is determined based on the least squares solution of the predistortion parameter.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017054153A1 (en) * | 2015-09-30 | 2017-04-06 | 华为技术有限公司 | Method and device for cancelling non-linear interference |
CN107276546A (en) * | 2016-04-08 | 2017-10-20 | 大唐移动通信设备有限公司 | A kind of digital pre-distortion processing method and device |
JP2018523940A (en) * | 2015-07-27 | 2018-08-23 | ノースロップ グラマン システムズ コーポレーション | Non-linear precoding by transmitter |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103685111B (en) * | 2013-12-26 | 2017-01-11 | 大唐移动通信设备有限公司 | Calculating method of digital pre-distortion parameters and pre-distortion system |
KR102296415B1 (en) * | 2015-02-13 | 2021-09-02 | 한국전자통신연구원 | Bandpass filter providing wide gain control range |
CN104869091A (en) * | 2015-04-29 | 2015-08-26 | 大唐移动通信设备有限公司 | Method and system for training digital predistortion coefficient |
CN105024960B (en) * | 2015-06-23 | 2018-11-09 | 大唐移动通信设备有限公司 | A kind of DPD system |
CN106453173A (en) * | 2016-11-24 | 2017-02-22 | 希诺麦田技术(深圳)有限公司 | Pre-distortion parameter estimation system and wireless transmitting system |
US10075201B1 (en) * | 2017-07-12 | 2018-09-11 | Intel IP Corporation | Adaptive nonlinear system control using robust and low-complexity coefficient estimation |
US10469109B2 (en) * | 2017-09-19 | 2019-11-05 | Qualcomm Incorporated | Predistortion for transmitter with array |
US10985951B2 (en) | 2019-03-15 | 2021-04-20 | The Research Foundation for the State University | Integrating Volterra series model and deep neural networks to equalize nonlinear power amplifiers |
CN111082756B (en) * | 2019-12-11 | 2023-06-06 | 电子科技大学 | Digital-analog mixed predistortion structure for MIMO transmitter |
CN111092602B (en) * | 2019-12-27 | 2023-10-20 | 京信网络系统股份有限公司 | Modeling method, modeling device, computer equipment and storage medium of power amplifier |
CN113659937B (en) * | 2021-05-10 | 2022-06-07 | 中兴通讯股份有限公司 | Pre-distortion processing method and device, communication equipment and storage medium |
CN115529211A (en) * | 2021-06-24 | 2022-12-27 | 华为技术有限公司 | Method and device for updating preprocessing parameters |
CN114900244B (en) * | 2022-05-13 | 2023-07-04 | 中国电子科技集团公司第三十研究所 | Signal distortion control system based on open loop digital predistortion |
CN114629756B (en) * | 2022-05-16 | 2022-08-16 | 成都凯腾四方数字广播电视设备有限公司 | Self-adaptive predistortion method and system for multimode 5G broadcast transmitter |
CN115987729B (en) * | 2022-06-24 | 2023-09-29 | 上海星思半导体有限责任公司 | Phase alignment method, phase alignment apparatus, and computer-readable storage medium |
CN115278746B (en) * | 2022-07-28 | 2023-03-28 | 北京邮电大学 | Self-adaptive fast error correction digital predistortion method for 5G broadband power amplifier |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102413083A (en) * | 2010-09-26 | 2012-04-11 | 电信科学技术研究院 | Signal processing method and device |
CN102511153A (en) * | 2011-11-16 | 2012-06-20 | 华为技术有限公司 | Method for generating microwave predistortion signal and device thereof |
CN103685111A (en) * | 2013-12-26 | 2014-03-26 | 大唐移动通信设备有限公司 | Calculating method of digital pre-distortion parameters and pre-distortion system |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6246286B1 (en) * | 1999-10-26 | 2001-06-12 | Telefonaktiebolaget Lm Ericsson | Adaptive linearization of power amplifiers |
US6903604B2 (en) * | 2001-06-07 | 2005-06-07 | Lucent Technologies Inc. | Method and apparatus for modeling and estimating the characteristics of a power amplifier |
US7289773B2 (en) * | 2003-01-23 | 2007-10-30 | Powerwave Technologies, Inc. | Digital transmitter system employing self-generating predistortion parameter lists and adaptive controller |
US7873172B2 (en) * | 2005-06-06 | 2011-01-18 | Ntt Docomo, Inc. | Modified volterra-wiener-hammerstein (MVWH) method for loudspeaker modeling and equalization |
US7479828B2 (en) * | 2005-11-15 | 2009-01-20 | Alcatel-Lucent Usa Inc. | Selecting samples for amplifier digital predistortion estimation |
US7929927B2 (en) * | 2007-10-29 | 2011-04-19 | Freescale Semiconductor, Inc. | Adaptive pre-distortion with interference detection and mitigation |
CN100594669C (en) * | 2008-07-18 | 2010-03-17 | 东南大学 | Power amplifier predistortion method of Hammerstein model based on fuzzy neural network |
JP5299958B2 (en) * | 2008-12-01 | 2013-09-25 | 日本無線株式会社 | Predistorter |
CN101771639B (en) * | 2008-12-31 | 2012-10-10 | 大唐移动通信设备有限公司 | Predistortion parameter processing method and device |
CA2815541A1 (en) * | 2010-11-16 | 2012-05-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Joint process estimator with variable tap delay line for use in power amplifier digital predistortion |
US9190963B2 (en) * | 2013-08-22 | 2015-11-17 | Blackberry Limited | System and method for fast polynomial pre-distortion |
-
2013
- 2013-12-26 CN CN201310741067.6A patent/CN103685111B/en active Active
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102413083A (en) * | 2010-09-26 | 2012-04-11 | 电信科学技术研究院 | Signal processing method and device |
CN102511153A (en) * | 2011-11-16 | 2012-06-20 | 华为技术有限公司 | Method for generating microwave predistortion signal and device thereof |
CN103685111A (en) * | 2013-12-26 | 2014-03-26 | 大唐移动通信设备有限公司 | Calculating method of digital pre-distortion parameters and pre-distortion system |
Non-Patent Citations (2)
Title |
---|
DENNIS, R.M. ET AL.: "A Generalized Memory Polynomial Model for Digital Predistortion of RF Power Amplifiers", IEEE TRANSACTION ON SIGNAL PROCESSING, vol. 10, no. 54, 31 October 2006 (2006-10-31), pages 3852 - 3860, XP055187301 * |
NAN, JINGCHANG ET AL.: "New LMEC Model for Behavior Modeling and Predistortion for RF Power Amplifiers", APPLICATION RESEARCH OF COMPUTERS, vol. 30, no. 8, 31 August 2013 (2013-08-31), pages 2448 - 2449, XP008181358 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2018523940A (en) * | 2015-07-27 | 2018-08-23 | ノースロップ グラマン システムズ コーポレーション | Non-linear precoding by transmitter |
JP2021036683A (en) * | 2015-07-27 | 2021-03-04 | ノースロップ グラマン システムズ コーポレーション | Non-linear transmitter pre-coding |
JP7198251B2 (en) | 2015-07-27 | 2022-12-28 | ノースロップ グラマン システムズ コーポレーション | Non-linear precoding by transmitter |
WO2017054153A1 (en) * | 2015-09-30 | 2017-04-06 | 华为技术有限公司 | Method and device for cancelling non-linear interference |
CN108141243A (en) * | 2015-09-30 | 2018-06-08 | 华为技术有限公司 | The counteracting method and device of a kind of Nonlinear perturbations |
CN108141243B (en) * | 2015-09-30 | 2019-11-29 | 华为技术有限公司 | A kind of counteracting method and device of Nonlinear perturbations |
CN107276546A (en) * | 2016-04-08 | 2017-10-20 | 大唐移动通信设备有限公司 | A kind of digital pre-distortion processing method and device |
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